Heavy Duty Die Grinder. This rugged die grinder has an energy-efficient 1/2hp motor with a built-in regulator that matches the speed to the job. The rear exhaust directs the air away from the work. Square handle design for a positive grip. 1/4" collet accepts all 1/4" shank grinding burrs and stones. (Be sure your burrs, stones, etc. are rated above 24,000 rpm). Maximum free speed: 24,000 rpm. Average air consumption: 5 cfm @ 90 psi. Length: 5 3/4". Weight: 1 1/4 lb. 1 year limited warranty.